> For the complete documentation index, see [llms.txt](https://doc.re-cast.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.re-cast.ai/api-specification/recast-nwp.md).

# RE:Cast NWP

Provides real-time numerical weather forecast data. Processes past forecast data with user-specified filters, or combines one or more numerical forecast datasets into a single output.

For available model combination codes (`modelComb`), please contact the administrator.

## Timezone Notice

By default, all input and output times are based on **local time (KST)**. Only the **parameters that specify the forecast cycle** must be provided in **UTC**.

* Values input/output in **local time (KST)**:
  * `basetime` (`yyyymmddhhmmss`)
  * Variable values in the response: `issueddate` (`yyyymmdd`, str), `issuedhour` (`hhmm`, str)
  * Request parameters: `startTime`, `endTime` (`yyyymmddhhmmss`)
* Values that must be input in **UTC** (specifies the forecast cycle):
  * For `recent`: issue date and time `issuedDateCycle` (`yyyymmddhh`, UTC)
  * For `recent-dayahead`: issue hour `hh` (`hh`, UTC)

## most-recent

Returns the latest available cycle forecast. By selecting an NWP model combination, multiple model results can be retrieved in a single request.

{% openapi src="/files/a8hSHftgITVqrNWMsBK2" path="/nwp/v2/most-recent" method="get" %}
[nwp\_v2\_en.json](https://2078064603-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F2T1Itz8eCZrBiyNqVxMh%2Fuploads%2Fgit-blob-2c658acb5485e53bc1b067d46d136c5aa1da9557%2Fnwp_v2_en.json?alt=media)
{% endopenapi %}

## recent

Returns the cycle forecast for a specified issue date (within the last 90 days) and cycle. By selecting an NWP model combination, multiple model results can be retrieved in a single request.

{% openapi src="/files/a8hSHftgITVqrNWMsBK2" path="/nwp/v2/recent" method="get" %}
[nwp\_v2\_en.json](https://2078064603-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F2T1Itz8eCZrBiyNqVxMh%2Fuploads%2Fgit-blob-2c658acb5485e53bc1b067d46d136c5aa1da9557%2Fnwp_v2_en.json?alt=media)
{% endopenapi %}

## recent-dayahead

Over the last 14 days, returns only the D+1 forecasts issued at the cycle of the specified `hh` (UTC).

{% openapi src="/files/a8hSHftgITVqrNWMsBK2" path="/nwp/v2/recent-dayahead" method="get" %}
[nwp\_v2\_en.json](https://2078064603-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F2T1Itz8eCZrBiyNqVxMh%2Fuploads%2Fgit-blob-2c658acb5485e53bc1b067d46d136c5aa1da9557%2Fnwp_v2_en.json?alt=media)
{% endopenapi %}

## recent-latest

Across all cycles (identified by issue date and time `yyyymmddhh`) within the last 14 days, returns only the latest forecast for each `basetime`.

{% openapi src="/files/a8hSHftgITVqrNWMsBK2" path="/nwp/v2/recent-latest" method="get" %}
[nwp\_v2\_en.json](https://2078064603-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F2T1Itz8eCZrBiyNqVxMh%2Fuploads%2Fgit-blob-2c658acb5485e53bc1b067d46d136c5aa1da9557%2Fnwp_v2_en.json?alt=media)
{% endopenapi %}

## past

Returns results from past forecast data filtered by the specified basetime range and filter conditions. The `filters` parameter accepts conditions such as `dayoffset` and `issuedhour`, enabling requests of up to 3+ weeks. Data retention is capped at 90 days (S3 lifecycle).

{% openapi src="/files/a8hSHftgITVqrNWMsBK2" path="/nwp/v2/past" method="get" %}
[nwp\_v2\_en.json](https://2078064603-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F2T1Itz8eCZrBiyNqVxMh%2Fuploads%2Fgit-blob-2c658acb5485e53bc1b067d46d136c5aa1da9557%2Fnwp_v2_en.json?alt=media)
{% endopenapi %}


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